Relevant bibliographies by topics / Instantaneous state vector

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Academic literature on the topic 'Instantaneous state vector'

Author: Grafiati
Published: 2 June 2025
Last updated: 31 July 2025

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Journal articles on the topic "Instantaneous state vector"

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Gong, Xuan, Di Chen Liu, Fei Fei Dong, and Bo Wang. "Study on 3-Phase PWM Rectifier Controlled by Direct Power." Applied Mechanics and Materials 325-326 (June 2013): 494–98. http://dx.doi.org/10.4028/www.scientific.net/amm.325-326.494.

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Based on the analysis on shortcomings of controlling strategies of direct power on the traditional 3-phase Boost-type PWM Rectifier through space vectors, a new controlling strategy is proposed in this paper. With this new strategy, the space vector is divided into 12 basic space vectors to form a new switching table. The instantaneous power controlling technology is realized through the control of instantaneous active power and reactive power by choosing the best switching state of PWM Rectifier. This new controlling strategy can put the input side unit power into operation, improve the effic
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Cohen, Robert A., and David M. Schultz. "Contraction Rate and Its Relationship to Frontogenesis, the Lyapunov Exponent, Fluid Trapping, and Airstream Boundaries." Monthly Weather Review 133, no. 5 (2005): 1353–69. http://dx.doi.org/10.1175/mwr2922.1.

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Abstract Although a kinematic framework for diagnosing frontogenesis exists in the form of the Petterssen frontogenesis function and its vector generalization, a similar framework for diagnosing airstream boundaries (e.g., drylines, lee troughs) has not been constructed. This paper presents such a framework, beginning with a kinematic expression for the rate of change of the separation vector between two adjacent air parcels. The maximum growth rate of the separation vector is called the instantaneous dilatation rate and its orientation is called the axis of dilatation. Similarly, a maximum de
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Yong, Yang. "Direct Instantaneous Power Control of Three-level Grid-connected." International Journal of Electrical and Computer Engineering (IJECE) 6, no. 3 (2016): 1260. http://dx.doi.org/10.11591/ijece.v6i3.8193.

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Power electronic grid-connected inverters are widely applied as grid interface in renewable energy sources. This paper presents direct instantaneous power control of a three-phase three-level Neutral Point Clamped (NPC) grid-connected inverter in photovoltaic generation systems. The system consists of a PV array, DC/DC converter, three-level NPC LC filter and the grid. In order to achieve maximum power point tracking (MPPT), an adaptive perturb and observe MPPT is used. For balancing the neutral point (NP) voltage, the control scheme through proportional integral (PI) control according to the
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Yong, Yang. "Direct Instantaneous Power Control of Three-level Grid-connected." International Journal of Electrical and Computer Engineering (IJECE) 6, no. 3 (2016): 1260. http://dx.doi.org/10.11591/ijece.v6i3.pp1260-1273.

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Power electronic grid-connected inverters are widely applied as grid interface in renewable energy sources. This paper presents direct instantaneous power control of a three-phase three-level Neutral Point Clamped (NPC) grid-connected inverter in photovoltaic generation systems. The system consists of a PV array, DC/DC converter, three-level NPC LC filter and the grid. In order to achieve maximum power point tracking (MPPT), an adaptive perturb and observe MPPT is used. For balancing the neutral point (NP) voltage, the control scheme through proportional integral (PI) control according to the
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Kromm, Andrey, Gennady Simakov, and Sergey Zhuk. "Highly dynamic observer of the magnetic state on the basis of the ventiled inductor motor." Proceedings of the Russian higher school Academy of sciences, no. 1-2 (June 19, 2020): 37–44. http://dx.doi.org/10.17212/1727-2769-2020-1-2-37-44.

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The article is devoted to the problem of developing highly dynamic flux observers for three-phase inductor motors. The synthesis of the flux observer is based on the analysis of the instantaneous powers of the motor stator by the vector control of drives. The observation algorithm lacks integral, differential and iterative methods of mathematics. The proposed observer algorithm is implemented in a vector-matrix form for its simplest integration into the modern vector control of electric drives. The observer provides stability and high precision in drives with direct torque control, in which th
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Gallardo-Alvarado, J., H. Orozco-Mendoza, and R. Rodríguez-Castro. "Finding the jerk properties of multi-body systems using helicoidal vector fields." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 222, no. 11 (2008): 2217–29. http://dx.doi.org/10.1243/09544062jmes1030.

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In this contribution, the kinematic angular and linear third-order properties, also known as jerk analysis, of a multi-body system are determined applying the concept of helicoidal vector fields. The reduced acceleration state, or accelerator, of the body of interest, with respect to a reference frame, is obtained as the time derivative, via a helicoidal field, of the velocity state, also known as the infinitesimal twist. Following that trend, the reduced jerk state, or jerkor, is obtained as the time derivative of the accelerator. The computation of the instantaneous centre of jerk, with its
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Grachev, Vladimir, Mihail Fedotov, Aleksandr Grischenko, Fedor Bazilevskiy, and Aleksandr Sharapov. "Locomotive Diesel Gas-Air Tract Diagnostics with the Use of Intellectual Classifier." Bulletin of scientific research results, no. 2 (June 23, 2022): 124–40. http://dx.doi.org/10.20295/2223-9987-2022-2-124-140.

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Purpose: Efficiency increase of operational monitoring of technical state of gas-air tract (GAT) of a locomotive diesel, assessment of possibility of using locomotive regular measuring tools to monitor diesel GAT technical state; feasibility justification for expanding the list of GAT parameters that are monitored by locomotive board diagnostics. Methods: An intelligent classifier based on Support Vector Machine (SVM) algorithm is used to determine the current technical condition (TC) class of GAT. Training sample of 96 item volume for eight classes of GAT TC was formed using “Diesel-RK” softw
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Żur, K. K. "The Maximum Principle of Pontryagin in Control of Twolegged Robot Based on Human Walking System." International Journal of Applied Mechanics and Engineering 19, no. 2 (2014): 407–17. http://dx.doi.org/10.2478/ijame-2014-0027.

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Abstract In the paper a hypothesis about state equations of human gait is presented. Instantaneous normalized power developed by human muscles at particular joints of a leg is a control vector in state equations of the human walking system. The maximum principle of Pontryagin in analysis of dynamic human knee joint was presented. The discrete Hamilton function of a knee joint is similar to a discrete square function of normalized power developed by muscles at the knee joint. The results satisfy optimal conditions and could be applied in control of exoskeleton and DAR type robot.
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Teppa-Garran, Pedro, Diego Muñoz-de Escalona, and Javier Zambrano. "Liquid level tracking for a coupled tank system using quasi–lpv control." Ingenius, no. 33 (January 6, 2025): 15–26. https://doi.org/10.17163/ings.n33.2025.02.

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This article proposes a gain-scheduling procedure based on quasi-LPV modeling for a nonlinear coupled tank system to track the liquid level with zero steady-state error. The nonlinearities are directly represented by a parameter vector that varies within a bounded set constrained by the physical limits of the tank system levels. This approach enables accurate nonlinear system modeling using a linear parameter-varying model. State-feedback linear controllers are designed at the extreme vertices of the bounded set. The global controller is derived as the weighted average of local controller cont
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Li, Yu. "A Recognition Method of Athletes’ Mental State in Sports Training Based on Support Vector Machine Model." Journal of Electrical and Computer Engineering 2022 (June 21, 2022): 1–9. http://dx.doi.org/10.1155/2022/1566664.

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Athletes participate in competitive competitions, and the ultimate goal is to better display their personal competitive level in the competition so as to achieve the goal of defeating their opponents and winning the competition. In all types of competitions, most matches are instantaneous, and opportunities are fleeting. The instantaneous nature and fierce competition of sports competitions require athletes who participate in sports competitions to have a high psychological quality. It can be seen that the quality of the mental state directly determines the performance of the athletes in usual
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Book chapters on the topic "Instantaneous state vector"

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Vas, Peter. "Artificial-intelligence-based steady-state and transient analysis of electrical machines and drives; Al-based estimators." In Sensorless Vector and Direct Torque Control. Oxford University PressOxford, 1998. http://dx.doi.org/10.1093/oso/9780198564652.003.0007.

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Abstract Traditionally mathematical-model-based analysis techniques have always been used for the steady-state and transient analysis of electrical machines. There are many techniques, but they mainly differ in their complexity and the many assumptions used. One of the most popular techniques relies on space-vector theory and is extensively used worldwide, and it is this technique which has also been extensively used in the present book for the development of various high performance, instantaneous torque-controlled drives.
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Novotny, D. W., and T. A. Lipo. "Parameter Sensitivity and Saturation Effects in Indirect Field Orientation." In Vector Control and Dynamics of AC Drives. Oxford University PressOxford, 1996. http://dx.doi.org/10.1093/oso/9780198564393.003.0008.

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Abstract The overall effect of this detuning is to incorrectly calculate the rotor field angle. In general, this causes the actual stator current components to be incorrect with the result that: (1) the flux level is not properly maintained, (2) the resulting steady state torque is not the commanded value, and (3) the torque response is not instantaneous.
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Yamamura, Sakae. "Spiral vector theory of AC circuits." In Spiral Vector Theory of AC Circuits and Machines. Oxford University PressOxford, 1992. http://dx.doi.org/10.1093/oso/9780198593799.003.0001.

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Abstract It seems that alternating current theory needs revising in two respects. First, steady-state analysis and transient-state analysis are treated in two separate theories: AC circuit theory and transient theory. Second, transients of AC machines are not adequately and sufficiently analysed. In AC theory, vector, or phasor, notation has been used for steady-state analysis since the beginning of the century. Although phasor notation has some outstanding merits, its use is confined to steady-state analyses of AC circuits and machines. The phasor, or vector, is a stationary vector in the com
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Lu, Guoqiang, Chunmeng Chen, Dongning Zhao, and Jian Zhang. "Research on Grid-Connected Active Control Technology of Photovoltaic Power Generation System." In Frontiers in Artificial Intelligence and Applications. IOS Press, 2024. http://dx.doi.org/10.3233/faia231269.

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In this study, the mathematical model of photovoltaic inverter is established, and the principle and structure of two-stage photovoltaic power generation system are analyzed by using coordinate transformation and feedforward decoupling control methods. Under the premise of grid voltage vector orientation, based on the instantaneous power theory, the active power support and reactive power compensation control strategy of photovoltaic power generation is established. Finally, the simulation model is constructed for experimental analysis. The experimental results show that the control strategy c
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Conference papers on the topic "Instantaneous state vector"

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Iseki, Toshio. "Instantaneous Spectral Analysis of Non-Stationary Ship Motion Data." In 25th International Conference on Offshore Mechanics and Arctic Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/omae2006-92197.

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The time varying coefficient vector autoregressive (TVVAR) modeling is applied to the cross-spectral analysis of non-stationary ship motion data. Introducing the instantaneous response, a vector autoregressive model can be reduced to simple time varying coefficient autoregressive (TVAR) models for each ship motion and the required CPU time is effectively reduced. The TVVAR model and stochastic perturbed difference equations are transformed into a state space model. The vector-valued unknown coefficients can be evaluated and the instantaneous cross spectra of ship motions can be calculated at e
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Obi, Shinnosuke. "On the Role of Correlation Between Instantaneous Velocity and Pressure-Gradient in Large-Scale Turbulence." In ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45355.

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Turbulent transport of Reynolds stress by triple moment of fluctuating velocity and pressure-velocity correlation are evaluated from a DNS for wake of a rectangular cylinder located in a uniform flow. The turbulent diffusion transport of turbulent kinetic energy hardly correlates with its gradient vector, indicating that the generally accepted gradient diffusion model is inadequate. It is inferred that the separate modeling of the individual Reynolds stress component provides a better possibility for modeling the turbulent transport in this flow, because of the strong departure from the equili
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Kolachalama, Srikanth, and Hafiz Malik. "Neural Network Model to Predict the Thermal Operating Point of an Electric Vehicle." In WCX SAE World Congress Experience. SAE International, 2023. http://dx.doi.org/10.4271/2023-01-0134.

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<div class="section abstract"><div class="htmlview paragraph">The automotive industry widely accepted the launch of electric vehicles in the global market, resulting in the emergence of many new areas, including battery health, inverter design, and motor dynamics. Maintaining the desired thermal stress is required to achieve augmented performance along with the optimal design of these components. The HVAC system controls the coolant and refrigerant fluid pressures to maintain the temperatures of [Battery, Inverter, Motor] in a definite range. However, identifying the prominent fact
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Sawada, Kokichi, Shinji Nakao, Tsuneaki Ishima, Tomio Obokata, Katsuyoshi Kawachi, and Kazumitsu Kobayashi. "Spray Formation and Fuel Flow Rate at the Multi-Stage Injections Injected From the Swirl Nozzle." In ASME/JSME 2003 4th Joint Fluids Summer Engineering Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/fedsm2003-45209.

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The structure, droplet characteristics and instantaneous fuel injection rate of two stage injection spray designed for direct injection gasoline engine were analyzed experimentally. A particle image velocimetry (PIV) to evaluate the instantaneous two-dimensional velocity field, a phase Doppler anemometer (PDA) and an instantaneous fuel flow rate meter based on a laser Doppler anemometer (LDA flow rate meter) were applied for the measurements. A swirl nozzle injector was used and injection conditions were 25 Hz of spray frequency, 2 ms and 1ms of the first and the second injection durations and
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Nakayama, Katsuyuki, Kenji Umeda, Toshio Ichikawa, Teruyuki Nagano, and Hideyuki Sakata. "Visualization System of Swirl Motion." In 12th International Conference on Nuclear Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/icone12-49189.

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An instrumentation of system composed of experimental device and numerical analysis is presented to visualize flow and identify swirling motion. Experiment is performed with transparent material and PIV (Particle Image Velocimetry) instrumentation, by which velocity vector field is obtained. This vector field is then analyzed numerically by “swirling flow analysis”, which estimate its velocity gradient tensor and the corresponding eigenvalue (swirling function). As an instantaneous flow field in steady/unsteady states is captured by PIV, the flow field is analyzed, and existence of vortices or
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Kost, Friedrich, Frank Hummel, and Maik Tiedemann. "Investigation of the Unsteady Rotor Flow Field in a Single HP Turbine Stage." In ASME Turbo Expo 2000: Power for Land, Sea, and Air. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/2000-gt-0432.

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Within a European project a high-pressure turbine stage was investigated at DLR, Göttingen. The investigations consisted primarily of experiments carried out in the windtunnel for Rotating Cascades (RGG), but some numerical work was also performed. Detailed measurements were carried out at mid section of a turbine rotor using a Laser-2-Focus device which served as a velocimeter measuring 2D-velocity vectors and turbulence quantities and as a tool to determine the concentration of coolant ejected at the trailing edge of the stator blades. The measurement of coolant concentration downstream of t
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Kong, Daekyeong, Gyeongrae Cho, Myoung-Jin Kim, et al. "Investigations on Energy Shares and Flow Structures of the Mixing Flow Using 3D-POD Analyses." In ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-5058.

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Abstract The objective of this report is investigate the influences of the mixing state to the productions of the vaterite crystal of CaCO3. In order to quantify the three-dimensional flow structures and their physical contribution to the mixing properties, a stereoscopic PIV (SPIV) has been adopted. The SPIV systems consists of two high speed cameras and an optical encoder which is used for trigging the SPIV system to capture the instantaneous flow images. A continuous laser (550nm) has been used. For mixing, an agitator having four blades has been used. The mixing tank has been filled with w
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Hayami, Hiroshi, Masahiro Hojo, Norifumi Hirata, and Shinichiro Aramaki. "Flow With Shock Waves in a Transonic Centrifugal Compressor With a Low-Solidity Cascade Diffuser Using PIV." In ASME Turbo Expo 2004: Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-53268.

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A single-stage transonic centrifugal compressor with a pressure ratio greater than six was tested in a closed loop with HFC134a gas. Flow at the inducer of a rotating impeller as well as flow in a stationary low-solidity cascade diffuser was measured using a double-pulse and double-frame particle image velocimetry (PIV). Shock waves in both flows were clearly observed. The effect of flow rate on a 3D configuration of shock wave at the inducer and a so-called rotor-stator interaction between a rotating impeller and a stationary cascade were discussed based on a phase-averaged measurement techni
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Tatoglu, Akin. "Parameter Identification and Closed Loop Control of a Flywheel Mounted Hovering Robot." In ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71877.

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A prototype of a hovering multi-terrain mobile robot platform that makes use of a flywheel for stabilization and heading control for rapid maneuverability was developed and presented in a prior paper. It was shown that flywheel stored energy could be transferred to the overall body to generate rapid angular motion once wheel is instantaneously stopped. Solution improved localization accuracy and reduced the overall sensitivity with respect to external disturbances such as non-flat terrain. In this paper, we present a feedback control system to measure dynamic parameters before and after the wh
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Hwang, C. J., and J. M. Fang. "Transonic Stall/Choke Flutter Analysis of Cascades by a Navier-Stokes Solution-Adaptive Approach." In ASME 1996 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1996. http://dx.doi.org/10.1115/96-gt-511.

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In this paper, the stall and choke flutter analyses of NACA 0006 unstaggered cascades in transonic viscous flows are presented by using a time domain approach. For the present time domain approach, a solution-adaptive finite volume method with rigid-deformable dynamic mesh treatment is adopted to solve the two-dimensional unsteady Navier-Stokes equations. The structural model equations, where each blade is treated as a typical section having plunging and pitching degrees of freedom, are integrated to obtain the blade displacements by an explicit four-stage Runge-Kutta scheme. In the present ca
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